Cooling device for dried wall-board sheets



E. JOHANSON July 14, 1964 COOLING DEVICE FOR DRIED WALL-BOARD SHEETSFiled March 10. 1960 2 Sheets-Sheet 1 2 Sheets-Sheet 2 s u r E. JOHANSONFIGB.

COOLING DEVICE FOR DRIEZD WALL-BOARD SHEETS LCECCCCCCCCC w FIC-3.2

July 14, 1964 Filed March l0, 1960 ZZ/ t INVENTOR` ERIK JoHANsoN ATTYS.

United States Patent() 3,140,929 COOLING DEVICE FOR DRIED WALL-BOARDSHEETS Erik Johanson, Sollentuna, Sweden, assigner to AktiebolagetSvenska Flaktfabriken, Nacka, Sweden Filed Mar. 10, 1960, Ser. No.14,045 Claims priority, application Sweden Mar. 12, 1959 6 Claims. (Cl.34-148) The present invention relates to a cooling device for driedwall-board sheets consisting of a discharge section connected to thedrying kiln, said section along its longer sides having walls shieldingthe section against the surrounding room atmosphere and having means forsupplying discharging cooling air.

In drying wall-board sheets, the sheets discharged from the drier arecooled during their passage through the discharge section and over theconveyors to the trimming saw. It has been found, however, that thiscooling is not suiiicient to allow the sheets to be stacked and storedimmediately after the sizing and trimming has been carried out withoutrisk of damage to the sheets. Recently, in order to improve the coolingof the sheets, the discharge section following the drying kiln has beenprovided with a suction fan connected to a hood mounted above saidsection. The diiiiculty of getting the local air exhausted in thismanner to impinge effectively against the wall-board sheets, however,also provides insuflicient cooling of thel sheets. It is an object ofthe invention -to carry out a rapid and effective cooling of driedWall-board sheets to make possible, in this way, stacking and storing ofthe iinished sheets without the previous risk of damage to the sheets.

The cooling device, according to the invention, is characterized in thatthe means for the supply of the cooling air consists of a supply fanwhich on its suction side is connected to a duct communicating with theatmosphere and on its pressure side is connected with an airdistributing hood arranged at one side of said discharge sectionadjacent to the transverse end Wall of the drying kiln. The hood isprovided with air supply nozzles corresponding in number to the numberof decks in the discharge section and pass through said side wall. Themeans for the discharge of the cooling air consists of a second fandesignated for a somewhat greater quantity of air and connected to anexhaust hood which, in a known manner, is arranged above said dischargesection. According to a preferred embodiment of the cooling device theexhaust hood is provided with a shielding plate mounted opposite the airdistributing hood to prevent the supplied cooling air from being suckeddirectly upwards into the exhaust hood. The duct connected to thesuction iside of the supply fan may be provided with a connecting'piecehaving a damper and, in addition, an adjusting damper can be arrangedbetween said connecting piece and an inlet for outdoor air to make itpossible to inject local air into the supplied cooling air. The airdistributing hood is secured to a traverse track by means of wheels tomake it possible when necessary to remove the air distributing hood fromsaid discharge section and the air distributing hood by means of a quickcoupling may be connected with the duct -for the supply fan.

The invention will now be described more in detail with reference to theaccompanying drawing figure illustrating exemplifying embodiments of thecooling device according to the invention7 and wherein:

FIG. 1 is a transverse sectional view through apparatus embodying thepresent invention;

FIG. 2 is a longitudinal sectional view taken on the line 2 2 of FIG. l;and

FIG. 3 is a transverse sectional view similar to FIG. l

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but a reduced scale showing a modified form of apparatus made inaccordance with the present invention.

In the drawing, a discharge section 1 is connected to the drying kiln,(not shown) having a plurality of decks for supporting wall board sheets7 one above the other and which along its longer sides is equipped withWalls Z shielding the section against the surrounding atmosphere in theroom. Accordingly the discharge section 1 communicates at one end withthe kiln and is open at its opposite end to the atmosphere. A number ofroller tracks 1a are arranged above each other and correspond in numberto the number of decks of said discharge section for conveying thewall-board sheets 7 which are discharged from the kiln. According to theinvention, cooling air is supplied as indicated generally at 3 and isdischarged as indicated at 4. In the illustrated embodiment, a propellerfan 5 has its suction side connected -to a duct 6a communicating withthe outside atmosphere and has its pressure side, by means of a ductbend 6b, connected with an air distributing hood 8 arranged at one sideof the discharge section mounted close to the transverse end Wall of thedrying kiln to supply cooling medium thereto. The hood 8 has a number ofair supply nozzles 9 which pass through the side Wall 2, the number ofthe nozzles corresponding to the number of decks of the dischargesection. A fan 10 discharges the cooling air through a duct 12 into theoutside atmosphere. An exhaust hood 11 is connected to said fan 10 andis arranged above the discharge section. The hood 11 includes ashielding plate 13 located opposite the air distributing hood 8 andextending horizontally beyond the horizontal extent of the nozzles so asto prevent the supplied cooling air from being sucked directly upwardsinto the exhaust hood 11. A connection piece 14 projecting from the duct6a and is provided with a damper 15 and is open to the atmosphere in theroom. Said damper 15 is actuated by means of an adjustment means 17. Inthe same way an adjusting damper 16 is mounted for operation Within theducts 6a Ibetween the connection piece 14 and the inlet for the outdoorair, which damper 16 is actuated by means of an adjusting means 18.dampers 15 and 16 make possible a commingling of local air into thesupplied cooling air. To make possible the removal of the airdistributing hood 8 from said discharge section the hood is secured to atraverse track In order to prevent part of the cooling air from leakingvinto the room the fan 10 is preferably designed to withdraw a somewhatlarger quantity of air than the supply fan 5. This will cause a part ofthe local air to iiow into the discharge section counter currently withrespect to the transport direction of the sheets.

Without departing from the invention idea the supply and discharge fanscan be varied with respect to their type and location.

As shown in FIG. 3, the discharge section may be provided with an airdistributing hood one each of the longitudinal sides of the section. Inthis iigure, the discharge section 21 having side walls 22 is covered bya hood connected to a duct for discharging the cooling air, as indicatedgenerally at 24. Cooling air is supplied through the opposite side Walls22 by supply means indicated generally at 23. Each of the supply means23 is similar to the supply means 3 of the previously describedembodiment and need not be described in detail herein.

While particular embodiments of the present invention have been hereinillustrated and described, it is not intended to limit the invention tosuch disclosure, but

The

(D changes and modifications may be made therein and thereto within thescope of the following claims.

What I claim is:

1. A device for cooling wall-board sheets after they have been treatedin a multi-deck kiln comprising a discharge section communicating at oneend with the kiln and open at its opposite end to the atmosphere, saiddischarge section including spaced side walls and a plurality of rollersmounted between the side walls providing supporting decks for the sheetscorresponding in number to the number of decks in the kiln, an airdistributing hood adjacent one of the side walls of the dischargesection having a plurality of nozzles corresponding in number to thenumber of decks and projecting through said side wall, each of saidnozzles approximately aligned with one of said decks, an air supply ductconnecting said air distributing hood with the atmosphere, an air supplyfan in said duct, an exhaust hood overlying said nozzles above saiddischarge section and in communication with said discharge section, anexhaust fan in said exhaust hood operable to exhaust a greater quantityof air than that being supplied by said supply fan so as to provide anegative pressure in said discharge section thereby preventing heatladen air from entering the atmosphere at said opposite end and, ashielding plate in said discharge section intermediate said airdistributing hood and exhaust hood, said plate extending horizontallybeyond the horizontal extent of said nozzles to thereby prevent thecooling air from being drawn directly into said exhaust hood.

2. A cooling device for dried wall-board sheets in accordance with claim1 including means including a track adjacent said discharge sectionsupporting said air distributing hood for selective movement thereofbetween a position adjacent said discharge section wherein said airsupply nozzles project into said discharge section and a position remotefrom said discharge section and means detachably connecting said hood tosaid air supply duct.

3. A cooling device for dried wall-board sheets in accordance with claiml wherein said spaced side walls are confronting, and including a secondair distributing hood adjacent the other of said side walls, said secondair distributing hood having a plurality of nozzles corresponding innumber to the number of supporting decks in said discharge section andprojecting through the respective side wall, each of its associatednozzles being aligned approximately with one of said decks, and an airsupply duct connecting said second air distributing hood to theatmosphere, and a second air supply fan in said duct.

4. A device according to claim 3 including means including a trackadjacent said discharge section supporting at least one of said airdistributing hoods for selective movement thereof between a positionadjacent said discharge section wherein said air supply nozzles projectthrough the side wall of said discharge section and a position remotefrom said side wall and means detachably connecting said hood to saidair supply duct.

5. A device for cooling wall-board sheets after they have been treatedin a multi-deck kiln comprising a discharge section communicating at oneend with the kiln and open at its opposite end to the atmosphere, saiddischarge section including spaced side walls and a plurality of rollersmounted between the side walls providing supporting decks for the sheetscorresponding in number to the number of decks in the kiln, an airdistributing hood adjacent one of the side walls of the dischargesection having a plurality of nozzles corresponding in number to thenumber of decks and projecting through said side walls, said nozzlesbeing arranged in a vertical row and each of said nozzles beingapproximately aligned with one of said decks, an air supply ductconnecting said air distributing hood with the atmosphere, an air supplyfan in said duct, an exhaust hood in communication with said dischargesection and in registry with the row of air supply nozzles, an exhaustfan in said exhaust hood operable to exhaust a greater quantity of airthan that being supplied by said supply fan, and a shielding plate insaid exhaust hood extending transversely to said row of nozzlesintermediate the nozzles and said exhaust hood, said plate extendinghorizontally beyond the horizontal extent of said nozzles so as toprevent the cooling air from being drawn directly into said exhausthood.

6. A device for cooling warp wall-board sheets after they have beentreated in a multi-deck kiln comprising a discharge sectioncommunicating at one end with the kiln and open at its opposite end tothe atmosphere, said discharge section including spaced side walls and aplurality of rollers mounted between the side walls providing supportingdecks for the sheets corresponding in number to the number of decks inthe kiln, an air distributing hood adjacent one of the side walls of thedischarge section having a plurality of nozzles corresponding in numberto the number of decks and projecting through said side wall, each ofsaid nozzles approximately aligned with one of said decks, an air supplyduct connecting said air distributing hood with the atmosphere, an airsupply fan in said duct, a connection piece projecting from said ductupstream `of said air supply fan and open to the room atmosphere, adamper in said air supply duct and connection piece, each of saiddampers being actuatable selectively to thereby regulate the flow ofcooling air through said duct and said connection piece, an exhaust hoodarranged above said discharge section and in communication therewith,and an exhaust fan in said exhaust hood operable to exhaust a greaterquantity of air than that being supplied by said supply fan so as t0provide a negative pressure in said discharge section thereby preventingheat laden air from entering the atmosphere at said opposite end.

References Cited in the le of this patent UNITED STATES PATENTS 452,902Coffee May 26, 1891 1,273,598 Flanagan July 23, 1918 1,447,836 Collieret al Mar. 6, 1923 1,656,802 Vance Jan. 17, 1928 1,776,014 Vance Sept.16, 1930 2,183,915 Killingstad Dec. 19, 1939 2,551,215 Lytton May 1,1951

1. A DEVICE FOR COOLING WALL-BOARD SHEETS AFTER THEY HAVE BEEN TREATEDIN A MULTI-DECK KILN COMPRISING A DISCHARGE SECTION COMMUNICATING AT ONEEND WITH THE KILN AND OPEN AT ITS OPPOSITE END TO THE ATMOSPHERE, SAIDDISCHARGE SECTION INCLUDING SPACED SIDE WALLS AND A PLURALITY OF ROLLERSMOUNTED BETWEEN THE SIDE WALLS PROVIDING SUPPORTING DECKS FOR THE SHEETSCORRESPONDING IN NUMBER TO THE NUMBER OF DECKS IN THE KILN, AN AIRDISTRIBUTING HOOD ADJACENT ONE OF THE SIDE WALLS OF THE DISCHARGESECTION HAVING A PLURALITY OF NOZZLES CORRESPONDING IN NUMBER TO THENUMBER OF DECKS AND PROJECTING THROUGH SAID SIDE WALL, EACH OF SAIDNOZZLES APPROXIMATELY ALIGNED WITH ONE OF SAID DECKS, AN AIR SUPPLY DUCTCONNECTING SAID AIR DISTRIBUTING HOOD WITH THE ATMOSPHERE, AN AIR SUPPLYFAN IN SAID DUCT, AN EXHAUST HOOD OVERLYING SAID NOZZLES ABOVE SAIDDISCHARGE SECTION, AN EXHAUST FAN IN SAID EXHAUST HOOD OPERABLE TOEXHAUST A GREATER QUANTITY OF AIR THAN THAT BEING SUPPLIED BY SAIDSUPPLY FAN SO AS TO PROVIDE A NEGATIVE PRESSURE IN SAID DISCHARGESECTION THEREBY PREVENTING HEAT LADEN AIR FROM ENTERING THE ATMOSPHEREAT SAID OPPOSITE END AND, A SHIELDING PLATE IN SAID DISCHARGE SECTIONINTERMEDIATE SAID AIR DISTRIBUTING HOOD AND EXHAUST HOOD, SAID PLATEEXTENDING HORIZONTALLY BEYOND THE HORIZONTAL EXTENT OF SAID NOZZLES TOTHEREBY PREVENT THE COOLING AIR FROM BEING DRAWN DIRECTLY INTO SAIDEXHAUST HOOD.